The first few crops of Dota millionaires all had the same backstory: "I played this game 14 hours a day. If there were tournaments at all they didn't really pay anything. My parents said I was wasting my life. I never had a girlfriend. Everyone thought I was a loser, but I just wanted to play and win... and now I know it was all worth it."
And the thing that I couldn't help thinking is: was it? I'm not sure that any rational person would make that decision. Even if you could somehow know that competitive gaming would get big enough, and that your particular game would be popular enough, and that you could become good enough to win – that's just table stakes. You then have to actually play the game obsessively for a decade. There are, frankly, far more comfortable ways to earn a million dollars in exchange for 20,000 to 50,000 hours of your life.
It's kind of hard to take a coherent message away from that. Should you become a competitive gamer for the millions? Certainly not then, and definitely not now. Should you hope that your fringe interest (bus tickets, say) becomes a million-dollar enterprise? No, that's probably even less likely.
Perhaps the message is just that millions are delivered to those with a combination of luck and the freedom to pursue rationally unjustifiable interests. A combination that is increasingly rare in an economic system designed to squeeze out the inefficient. Lest we forget the Bell monopoly; we may never see such inefficiency again.